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https://issues.apache.org/jira/browse/CALCITE-5285?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Yu Xu resolved CALCITE-5285.
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Fix Version/s: 1.43.0
Resolution: Fixed
Fixed in
[https://github.com/apache/calcite/commit/f7a074248f1b7ec610e58cdc45f6ba6f4dd14cc5]
Thank you reported this Jira [~krzysztof.slusarski]
Thank you for the review [~mbudiu]
> CalcReduceExpressionsRule may transform to same rel
> ---------------------------------------------------
>
> Key: CALCITE-5285
> URL: https://issues.apache.org/jira/browse/CALCITE-5285
> Project: Calcite
> Issue Type: Bug
> Components: server
> Reporter: Krzysztof Ślusarski
> Assignee: Yu Xu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.43.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> Method {{CalcReduceExpressionsRule#onMatch}} enters the branch and calculates
> {{reduceExpressions()}} condition. If that one is true it creates new calc.
> Unfortunately logic in {{reduceExpressions()}} is different then in the rest
> of the method and it can create a calc that is equal to the input.
> Example query {{{}SELECT floor(this / 1) FROM test{}}}.
> Input calc contains program with exprs:
> {{0 = \{RexInputRef@11348} "$0"}}
> {{1 = \{RexInputRef@11349} "$1"}}
> {{2 = \{RexCall@11350} "CAST($t1):BIGINT(32)"}}
> {{3 = \{RexLiteral@11351} "1:BIGINT(32)"}}
> {{4 = \{RexCall@11352} "/($t2, $t3)"}}
> {{5 = \{RexCall@11353} "FLOOR($t4)"}}
> The one on index 4 can be simplified (the division can be removed). That
> condition is met in {{{}reduceExpressions(){}}}, but following logic in
> {{onMatch()}} doesn't simplify that expression.
> This makes the output calc equals to input one which breaks the rest of query
> optimizing.
>
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